This modified version of Voltage input Power Monitor uses most sturdy micro-controller to provide a reliable performance. The unit operates from 24V DC power and takes 0-10V DC input. Output is calibrated to show 100.0% load. Provision to set various control parameters like startup delay, trip-off delay, set limit and gain is provided on the front panel. LED’s are provided on the front panel to indicate the parameters being displayed and also to indicate the control relay status. The control relay is de-energized whenever the actual value exceeds the set value.
There are other models which accept 0-20mAdc/pulse input straight from the motor drive, these inputs are directly proportional to the load on the tool. The products mentioned here, takes input from these direct and indirect measurements, which are monitor and tripped when the input crosses the set limits.
Power monitors are designed to monitor the load on the cutting tool without any external sensors mounted on the tool, in induction motor driven applications. The load is measured indirectly by measuring the input power to the motor. The power drawn by the motor increases, with increase in load on the tool. There will be a substantial increase in the input power during accident condition like tool breakage or jamming. This condition can be sensed and the motor can be tripped, avoiding further accidents.